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Homemade Air rifle problems.(valve and power)

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Homemade Air rifle problems.(valve and power)

Unread postAuthor: Blackdavid » Fri Dec 27, 2013 9:19 am

Hello. I love snipers, and i was building one myself yesterday. I used a small scuba air tank, a bike pump and bike tire valve, and a ball valve to build it. The problems are two:

IMG1245.jpg


1. The rifle is the less powerfull thing on the whole earth! I pumped about 2bar of pressure in the tank, and put a nail in the chamber just to test the power. And the nail just fell out of the chamber in front of my legs. How can i make it more powerfull?

2. As the trigger, i added a ball valve. Its good and it holds the air in, but i have to extend my arm to get to it, and loose precision. Is there any other thing i can put instead of the ball valve? Maybe a solenoid valve, or a mechanical one? Maybe just some rods and plaques to the existing one so i can triger it from the place where i hold my hand? I even wondered, as I am a car and moto mechanic i have all kind of parts at home, and i wondered if I could use a car fuel injector to use as the valve? GIve me your suggestions and homemade valve projects please! Also, if someone has a link of a small electric air valve, maybe 9V, give it to me please! THanks for the help! :lol:
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Re: Homemade Air rifle problems.(valve and power)

Unread postAuthor: jackssmirkingrevenge » Sat Dec 28, 2013 3:44 am

Blackdavid wrote:1. The rifle is the less powerfull thing on the whole earth! I pumped about 2bar of pressure in the tank, and put a nail in the chamber just to test the power. And the nail just fell out of the chamber in front of my legs. How can i make it more powerfull?


2 bar is nothing - for a small caliber you need high pressure for high power.

Consider getting a bicycle shock pump that can go to the 20-25 bar range:

Image

You could also adapt a fridge compressor to go to higher pressures:



2. As the trigger, i added a ball valve. Its good and it holds the air in, but i have to extend my arm to get to it, and loose precision. Is there any other thing i can put instead of the ball valve? Maybe a solenoid valve, or a mechanical one? Maybe just some rods and plaques to the existing one so i can triger it from the place where i hold my hand? I even wondered, as I am a car and moto mechanic i have all kind of parts at home, and i wondered if I could use a car fuel injector to use as the valve? GIve me your suggestions and homemade valve projects please! Also, if someone has a link of a small electric air valve, maybe 9V, give it to me please! THanks for the help! :lol:


A ball valve on its own is a poor valve.

You can make it spring loaded: http://www.sentex.net/~mwandel/cannon/air_gun.html

Image

If you don't want to use too high pressures, a solenoid valve is an option. Plenty of cheap ones on eBay, this is a good example: http://www.ebay.com/itm/New-Brass-12V-D ... 4611de28dc
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